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SUMMARY OF RESTRICTED STOCK UNITS (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]          
Unvested (in shares) 300,158   300,158   257,096
Granted (in shares) 0 137 98,680 143,305  
Vested (in shares)     (43,169)    
Forfeited (in shares)     (12,449)    
Unvested, Weighted Average Fair Value (in dollars per share) $ 58.29   $ 58.29   $ 57.47
Granted, Weighted Average Fair Value (in dollars per share) $ 0.00 $ 54.67 71.65 $ 42.45  
Vested in Period, Weighted Average Fair Value (in dollars per share)     85.17    
Forfeited in Period, Weighted Average Fair Value (in dollars per share)     $ 53.91